﻿//  Copyright 2020 Google Inc. All Rights Reserved.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.

#nullable enable

using System;
using System.Linq;
using NtCoreLib.Win32.Service.Interop;

namespace NtCoreLib.Win32.Service.Triggers;

/// <summary>
/// Service trigger for a WNF event.
/// </summary>
public class WnfServiceTriggerInformation : ServiceTriggerInformation
{
    /// <summary>
    /// The WNF name.
    /// </summary>
    public NtWnf? Name { get; }

    private protected override string GetSubTypeDescription()
    {
        if (SubType == CUSTOM_SYSTEM_STATE_CHANGE_EVENT_GUID && Name != null)
        {
            return $"{base.GetSubTypeDescription()} {Name.Name}";
        }
        return base.GetSubTypeDescription();
    }

    internal WnfServiceTriggerInformation(SERVICE_TRIGGER trigger)
        : base(trigger)
    {
        var data = CustomData.FirstOrDefault();
        if (data?.RawData?.Length != 8)
        {
            return;
        }

        Name = NtWnf.Open(BitConverter.ToUInt64(data.RawData, 0), true, false).GetResultOrDefault();
    }

    /// <inheritdoc/>
    public override void Trigger()
    {
        Name?.UpdateStateData(new byte[1]);
    }

}
#pragma warning restore

